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Sister 2×10 joist with a 2×8

We are looking into continuing work on our story duplex basement. Our basement in most areas is anywhere from 6.1 to 6.5 inches. I am looking to gain an additional 2 inches of head room. Right now the cost of lowering the floor would not net a vailable return. However…

The basement is approx. 1200 sq/ft. The floor joists are 2×10, (16″ OS) (true cut) and do not run longer than 11 feet. This is an older construction, at the moment there are no hangars attaching the joists to the 2 main cross beams. My idea is to sister 2×8 beams to the existing 2×10 and trim down the 2x10s to 8 inches and use a 4×8 or 4×6 joist hangers. Additionally all the beams are notched at either end, but the notch doesn’t serve a purpose.

The tables indicate that a 2×8 with my current span is feasible. I have just not found many references to this type of job. We want to keep an open ceiling concept in the basement, so any head room gained is worth it and I would assume, in theory, be shoring up the floor with the sistering of the joists, addition of hangers and would add blocking (since there is none). Does this make sense?

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